Disagreements in published boiling temperatures of tin, gallium etc.

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The discussion highlights significant discrepancies in the published boiling temperatures of tin and gallium, with variations of hundreds of degrees Celsius across different sources. For tin, values range from 2270 °C in the Penguin Dictionary of Chemistry to 2720 °C in Chemistry, Molecules, Matter and Change. Similarly, gallium's boiling point is reported as 2403 °C in the Penguin Dictionary and 2070 °C in another textbook. The conversation raises questions about the reliability of these sources and the reasons behind such inconsistencies, suggesting that these discrepancies are not uncommon in scientific literature.

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I have noted big disagreements of a scale of hundreds of degrees centigrade in published values for the boiling temperature of chemical elements such as tin and gallium.

For example,

Tin
http://en.wikipedia.org/wiki/Tin" - 2602 °C, 2875 K, 
http://www.chemicalelements.com/elements/sn.html" - 2270.0°C, 2543.15 K
which agrees with one of my textbooks
Penguin Dictionary of Chemistry - 2270°C
but not the other
Chemistry, Molecules, Matter and Change - 2720°C


Gallium
http://en.wikipedia.org/wiki/Gallium" - 2204 °C, 2477 K, 
http://www.chemicalelements.com/elements/ga.html" 2403.0 °C, 2676.15 K
which agrees with one of my textbooks
Penguin Dictionary of Chemistry - 2403 °C
but not the other
Chemistry, Molecules, Matter and Change - 2070 °C


Of course I am wondering why the different values - errors by the authors of books or websites or genuine disagreements between scientists as to the values?

Which source do people recommend as the most reliable source of accurate boiling temperature information and why?
 
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I can't tell you what is the best source, what I can tell you is that such discrepancies are nothing unusual. Sometimes they can be traced down to separate sources that originally published different values of something. If I recall correctly that's the case with density tables of the sulfuric acid - they come in two flavors, and I have seen both versions printed already in books from before IWW. All later ones where just reprints.